Diagnostic preparations for medical use; diagnostic substances for medical use; medical diagnostic test strips for saliva analysis for the early detection of Alzheimer's Disease and Mild Cognitive Impairment associated with Alzheimer's Disease; diagnostic agents for medical use; diagnostic products for medical use, namely, medical diagnostic reagents and immunoassay kits for in vitro quantification of salivary lactoferrin; diagnostic testing materials for medical use, namely, diagnostic test ...